Any idea why?
Yes. The old chain and the old sprocket were equally knackered, the pitch elongation of the former precisely matching the tooth wear of the latter. It's in Chain Drives 1.01; never use an old chain on new sprockets.
@gbj_tester started
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Yes. The old chain and the old sprocket were equally knackered, the pitch elongation of the former precisely matching the tooth wear of the latter. It's in Chain Drives 1.01; never use an old chain on new sprockets.